<div nz-tooltip
     *ngIf="nzTipFormatter !== null && nzTooltipVisible !== 'never'"
     class="ant-slider-handle"
     [ngStyle]="style"
     [nzTitle]="tooltipTitle"
     [nzTrigger]="null"
     [nzPlacement]="nzTooltipPlacement"></div>
<div *ngIf="nzTipFormatter === null || nzTooltipVisible === 'never'"
     class="ant-slider-handle"
     [ngStyle]="style"></div>
